...regarding your question whether or not people 
have trouble selling these cels. When I do buy 
higher end cels, I usually ask myself two 
questions:

A)Of course, can I afford to spend the dough?
B)Is this EXACTLY what I want?
and C)Is there any remote possibility that I will 
sell this later on?

If the answers are Yes, Yes, and No respectively, 
then I'll do it. I would say my average cel is 
worth around $100. However, I do have several 
higher end cels that range from $200-$750. I 
agree with chipn and Drac in that my favorite 
cels tend to be the ones that didn't break my 
bank account. Although, my Harley Quinn cel 
always makes me laugh ^o^